pwm.c: channels running - visible from the outside

[bike-lights.git] / firmware / ambient.c

diff --git a/firmware/ambient.c b/firmware/ambient.c
index 025b0c4bd6dcb6839395a36f91a8fedd4dc97e73..02377ccd46586ab1895083adeb09dbda77ff50e5 100644 (file)
--- a/firmware/ambient.c
+++ b/firmware/ambient.c
@@ -1,52 +1,116 @@
 #include <avr/io.h>
+#include <avr/eeprom.h>
 
 #include "lights.h"
 
+#define AMBIENT_VAL_SHIFT 2
 static uint16_t ambient_val;
 volatile unsigned char ambient_zone;
-static unsigned char ambient_zone_set;
+static unsigned char ambient_min, ambient_max;
 
-static uint16_t ambient_zones[] = {
-       0x0c00, 0x0d00, 0x1000, 0x1800, 0x2800, 0x2f80, 0xffff
+/* logging */
+#define AMBIENT_LOG_SIZE 128
+static unsigned char ambient_log_offset_stored EEMEM;
+static unsigned char ambient_log_offset;
+static unsigned char ambient_log[AMBIENT_LOG_SIZE] EEMEM;
+
+/* My photodiode reads 0x00C5 .. 0x033B */
+typedef struct {
+       uint16_t lo, hi;
+} ambient_zone_t;
+
+/*
+ * Note: these have to be sorted, starting with 0, ending with 0xFFFF
+ * and having small overlaps in order to provide a bit of hysteresis.
+ */
+static ambient_zone_t ambient_zones[] = {
+       { 0x0000                   , 0x0280<<AMBIENT_VAL_SHIFT }, // dark
+       { 0x0270<<AMBIENT_VAL_SHIFT, 0x02f0<<AMBIENT_VAL_SHIFT }, // evening
+       { 0x02e8<<AMBIENT_VAL_SHIFT, 0x030a<<AMBIENT_VAL_SHIFT }, // dawn
+       { 0x0308<<AMBIENT_VAL_SHIFT, 0xffff                    }, // day
 };
 #define N_AMBIENT_ZONES (sizeof(ambient_zones)/sizeof(ambient_zones[0]))
 
 void init_ambient()
 {
        ambient_val = 0;
-       ambient_zone = 0;
-       ambient_zone_set = 0;
+       ambient_max = 0;
+       ambient_min = 0xFF;
+       ambient_zone = 1;
+
+       ambient_log_offset = eeprom_read_byte(&ambient_log_offset_stored);
+
+       if (ambient_log_offset == AMBIENT_LOG_SIZE)
+               ambient_log_offset = 0; // start over
+}
+
+void susp_ambient()
+{
+       unsigned char stored_offset;
+
+       ambient_log_min_max();
+
+       stored_offset = eeprom_read_byte(&ambient_log_offset_stored);
+       if (stored_offset != ambient_log_offset)
+               eeprom_write_byte(&ambient_log_offset_stored,
+                       ambient_log_offset);
+}
+
+void ambient_log_min_max()
+{
+       if (ambient_log_offset >= AMBIENT_LOG_SIZE - 1)
+               return;
+
+       eeprom_write_byte(&ambient_log[ambient_log_offset++], ambient_min);
+       eeprom_write_byte(&ambient_log[ambient_log_offset++], ambient_max);
+
+       ambient_min = 0xFF;
+       ambient_max = 0;
 }
 
 void ambient_zone_changed()
 {
+#if 1
        log_byte(0xab);
        log_byte(ambient_zone);
        log_word(ambient_val);
        log_flush();
+#endif
 
-       pattern_reload();
+       // led_set_pattern(N_PWMLEDS, status_led_pattern_select());
+       // led_set_pattern(N_PWMLEDS+1, illumination_led_pattern_select());
+       // pattern_reload();
 }
 
 void ambient_adc(uint16_t adcval)
 {
-       unsigned char newzone;
-
-       if (!ambient_zone_set)
-               ambient_val = adcval << 4;
-       else // running sum
-               ambient_val += adcval - (ambient_val >> 4);
-
-       newzone = 0;
-       while (newzone < N_AMBIENT_ZONES-1
-               && ambient_zones[newzone] < ambient_val)
-               newzone++;
-
-       // TODO: implement hysteresis?
-       if (!ambient_zone_set || newzone != ambient_zone) {
-               ambient_zone = newzone;
-               ambient_zone_set = 1;
-               // ambient_zone_changed();
+       unsigned char old_zone = ambient_zone;
+       unsigned char byte_val;
+
+       ambient_val += adcval - (ambient_val
+               >> (AMBIENT_VAL_SHIFT - AMBIENT_ADC_SHIFT));
+
+       while (ambient_zones[ambient_zone].lo > ambient_val)
+               ambient_zone--;
+
+       while (ambient_zones[ambient_zone].hi < ambient_val)
+               ambient_zone++;
+
+       byte_val = adcval >> 2;
+
+       if (ambient_min > byte_val)
+               ambient_min = byte_val;
+
+       if (ambient_max < byte_val)
+               ambient_max = byte_val;
+#if 0
+       if (old_zone != ambient_zone) {
+               log_byte(0xab);
+               log_byte(ambient_zone);
+               log_word(adcval);
+               log_flush();
        }
+               // ambient_zone_changed();
+#endif
 }